Description of Business and Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended				6 Months Ended
	Dec. 31, 2015	Jul. 20, 2015	Apr. 25, 2013	Jul. 31, 2015	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule Of Description Of Business And Basis Of Presentation [Line Items]
Effect of change in net loss per share						$ 0.11
Translation Adjustment Functional to Reporting Currency, Net of Tax	$ (11,600)				$ (6,400)				$ (6,400)
Business transition costs					2,756		$ 1,636		8,063	$ 9,896
Relocation, consulting, and other costs							1,600			9,900
Severance Costs								$ 3,400
Total recorded liability associated with early lease termination	4,100				3,500				3,500
Product shipment costs					6,600		5,200		12,800	10,300
Litigation accrual adjustment					43,310		(568)	$ 42,575	43,310	42,007
Litigation charge										3,300
Litigation loss offset										3,300
OIG [Member]
Schedule Of Description Of Business And Basis Of Presentation [Line Items]
Loss contingency, settlement agreement, consideration				$ 13,500
Litigation accrual adjustment										13,800
Litigation loss offset										13,800
Medtronic Litigation [Member]
Schedule Of Description Of Business And Basis Of Presentation [Line Items]
Loss contingency, settlement agreement, consideration			$ 7,500		45,000				45,000
Litigation accrual adjustment					$ 43,300				43,300	56,400
NeuroVision trademark litigation [Member]
Schedule Of Description Of Business And Basis Of Presentation [Line Items]
Loss contingency, settlement agreement, consideration		$ 27,200
Litigation accrual adjustment							$ 2,800			2,800
Sales, Marketing and Administrative Expense [Member]
Schedule Of Description Of Business And Basis Of Presentation [Line Items]
Restructuring and associated impairment charges									400	$ 2,300
Chief Executive Officer and Chairman of the Board [Member]
Schedule Of Description Of Business And Basis Of Presentation [Line Items]
Severance Costs									$ 3,400
Accounting Standards Update 2016-09 [Member]
Schedule Of Description Of Business And Basis Of Presentation [Line Items]
Adjustment of deferred tax assets and accumulated deficit	$ 16,600
Adjustment of provision for income taxes						$ 5,500
Effect of change in net loss per share						$ 0.11